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Security Advisory

USN-5732-1: Unbound vulnerability




Canonical Ubuntu

Versions Affected

  • Canonical Ubuntu 18.04


It was discovered that Unbound incorrectly handled delegations with a large number of non-responsive nameservers. A remote attacker could possibly use this issue to cause Unbound to consume resources, leading to a denial of service. Update Instructions: Run `sudo pro fix USN-5732-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: unbound – 1.9.4-2ubuntu1.4 python3-unbound – 1.9.4-2ubuntu1.4 libunbound8 – 1.9.4-2ubuntu1.4 python-unbound – 1.9.4-2ubuntu1.4 unbound-anchor – 1.9.4-2ubuntu1.4 unbound-host – 1.9.4-2ubuntu1.4 libunbound-dev – 1.9.4-2ubuntu1.4 No subscription required

CVEs contained in this USN include: CVE-2022-3204.

Affected Cloud Foundry Products and Versions

Severity is medium unless otherwise noted.

  • cflinuxfs3
    • All versions prior to 0.336.0
  • CF Deployment
    • All versions prior to 23.3.0


Users of affected products are strongly encouraged to follow the mitigations below. The Cloud Foundry project recommends upgrading the following releases:

  • cflinuxfs3
    • Upgrade all versions to 0.336.0 or greater
  • CF Deployment
    • Upgrade all versions to 23.3.0 or greater


2022-12-07: Initial vulnerability report published.

Cloud Foundry Foundation Security Team Profile Image

Cloud Foundry Foundation Security Team, AUTHOR